Title

Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

In this paper, the dynamic behavior and foundation improvement of a K10-type compressor with maximum horizontal load of 1800 KN, operating at 3.3 Hz (200 rpm) located at top of a concrete foundation is studied. The vibration measurements (acceleration, velocity, and displacement) of the compressor and its foundation have been recorded before and after cement pressure grouting. In brief, the maximum displacement before cement injection exceeded the specified values by the manufacturer. Therefore, the existing pile-soil-foundation system needed to be improved. As the result, a retrofit scheme using cement pressure grouting by injection was recommended. In order to predict the dynamic behavior of the foundation after cement pressure grouting, a finite element model was constructed and then calibrated with the measurements that were taken before cement injection. Second set of measurements for compressor were carried out and results were compared with the model results after cement injection and curing procedure. It was concluded that the model has the ability to simulate and predict the behavior of the compressor accurately. The results show that the cement injection technique can be a reasonable and cost- effective remedial alternative to reduce the dynamic vibrations of the compressor. Moreover, the dynamic behavior of the compressor can be modeled using FEM.

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Retrofitting of the Compressor Foundation by Cement Grouting

Arlington, Virginia

In this paper, the dynamic behavior and foundation improvement of a K10-type compressor with maximum horizontal load of 1800 KN, operating at 3.3 Hz (200 rpm) located at top of a concrete foundation is studied. The vibration measurements (acceleration, velocity, and displacement) of the compressor and its foundation have been recorded before and after cement pressure grouting. In brief, the maximum displacement before cement injection exceeded the specified values by the manufacturer. Therefore, the existing pile-soil-foundation system needed to be improved. As the result, a retrofit scheme using cement pressure grouting by injection was recommended. In order to predict the dynamic behavior of the foundation after cement pressure grouting, a finite element model was constructed and then calibrated with the measurements that were taken before cement injection. Second set of measurements for compressor were carried out and results were compared with the model results after cement injection and curing procedure. It was concluded that the model has the ability to simulate and predict the behavior of the compressor accurately. The results show that the cement injection technique can be a reasonable and cost- effective remedial alternative to reduce the dynamic vibrations of the compressor. Moreover, the dynamic behavior of the compressor can be modeled using FEM.